|Publication number||US7889080 B2|
|Application number||US 11/627,551|
|Publication date||Feb 15, 2011|
|Filing date||Jan 26, 2007|
|Priority date||Jan 25, 2006|
|Also published as||US20070171067|
|Publication number||11627551, 627551, US 7889080 B2, US 7889080B2, US-B2-7889080, US7889080 B2, US7889080B2|
|Original Assignee||Mitac International Corp.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (31), Referenced by (7), Classifications (5), Legal Events (2)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention generally relates to a control system, and more specifically relates to the control system that enables a satellite navigation apparatus to be automatically turned on or off.
As science and technology advances, a global positioning system (GPS) originally designed for military purposes is opened to the public and commercial use now, and the American global positioning system includes 24 geostationary satellites operated in 6 orbits with an altitude of approximately 20,000 kilometers and revolving around the earth once every 12 hours so that each satellite can be assured to passes through a same point on the surface of the earth at the same time everyday so as to constitute virtual coordinates in the space.
Folks can possess and use a receiver to track all satellites of the global positioning system and immediately compute the coordinates of the location, the moving speed and time of the receiver. The principle of computing these data relies on that the coordinate of the location of any satellite in the space at any moment is taken as a known value when the satellite is in motion. The coordinate of the location of the receiver is taken as an unknown value. The time taken for sending a message from the satellite in the space to the receiver can be calculated by comparing the clock of the satellite with the clock within the receiver. The product of the time difference and the speed of the transmitted electric waves (which is generally set to the speed of light) can be used to compute the distance between the satellite in the space and a user's receiver. Therefore, a related equation can be derived from the trigonometric vector relations.
In general, the coordinates of the location of our receivers can be calculated by the aforementioned principle. A related equation will be obtained for every signal received from a satellite so that after the signals transmitted from three or more satellites are received, planar coordinates (longitude and latitude) can be further calculated. If the signals transmitted from four satellites are received, the altitude of the GPS can be found, and if the signals transmitted from five or more satellites are received, then the accuracy of the calculation will be improved.
As the GPS becomes an open system, people continue researches to enable a personal digital assistant (PDA) to be integrated with the GPS for different applications. However, traditional PDAs still require users to manually turn on or off the PDAs even though the GPS is combined, and then start the GPS for the navigation function after the PDA is turned on. Such procedure causes inconvenience to users and fails to provide a user-friendly man-machine interface.
Therefore, the inventor of the present invention based on years of experience in the related field from conducting research and experiments, invents a control system in accordance with the present invention in the hope of obtaining expected results and overcoming the shortcomings of the prior arts.
Therefore, it is a primary objective of the present invention to provide a control system applied to a satellite navigation apparatus of a personal digital assistant. Users can bring a tag of the system with them to a car, so that an apparatus body of the system will be turned on automatically and converted from a sleep mode into a wakeup mode for performing a navigation function. After users take the tag away from the car, the apparatus body will be turned off automatically and converted from the wakeup mode to the sleep mode. There is no need for users to press any button or give instructions to turn on or off the system, and thus the invention makes the satellite navigation apparatus more user-friendly.
To achieve the foregoing objective, a control system of the invention applied to a satellite navigation apparatus comprises an apparatus body, a tag, a reader, a recognition module, and a processor. The apparatus body is installed in the satellite navigation apparatus for providing a navigation function. The tag is installed on an object such as a key for providing a recognition data such as a recognition code. The reader is installed in the satellite navigation apparatus for detecting and reading the recognition data. The recognition module is installed in the satellite navigation apparatus for comparing the recognition data with a predetermined recognition data; if the recognition data matches the predetermined recognition data, then the recognition module will generate a trigger signal. The processor is installed in the satellite navigation apparatus for receiving the trigger signal to drive the apparatus body to perform a wakeup mode. If the processor does not receive a trigger signal in a predetermined period, then the processor will drive the apparatus body to enter a sleep mode. In addition, a light module, a sound module or a GPS module is turned off under the sleep mode; and a light module, a sound module, or a GPS module is turned on under the wakeup mode. If the GPS module is turned on, a satellite positioning will be performed or a navigation function will be executed.
The foregoing control method of the present invention is applied to a satellite navigation apparatus, wherein the satellite navigation apparatus includes an apparatus body and a processor, and the apparatus body provides a navigation function. The method comprises the steps of installing a tag on an object to generate a recognition data; installing a reader in the satellite navigation apparatus, and the reader is provided for detecting and reading the recognition data; installing a recognition module in the satellite navigation apparatus, and the recognition module is provided for comparing the recognition data with a predetermined recognition data; if the recognition data matches the predetermined recognition data, then the recognition module will generate a trigger signal; if the processor receives the trigger signal, then the processor will drive the apparatus body to perform a wakeup mode; if the processor does not receive the trigger signal in a predetermined period, then the processor will drive the apparatus body to enter a sleep mode, so as to achieve the effect of turning on or off the satellite navigation apparatus automatically.
To make it easier for our examiner to understand the objective of the invention, its innovative features and performance, a detailed description and technical characteristics of the present invention are described together with the drawings as follows.
In the related figures of a control system according to a preferred embodiment of the present invention, the same elements are represented by the same numbers indicated in the figures.
The foregoing tag 13 adopts a radio frequency identification (RFID) technology, and the so-called RFID technology refers to a contactless automatic identification technology that uses wireless radio frequency waves to identify objects and can be applied for the tag and the reader. The core element is the tag having a diameter less than 2 mm and including a wireless communication circuit and a memory for sending the required data to the reader through the wireless electric waves transmitted by a sensor within the distance from several centimeters to several meters and accomplishing a contactless data transmission by using the principle of passing radio frequency signals through a space coupling (alternating magnetic field or electromagnetic field).
It should be noted that the object can also be a vehicle, and the tag can be attached to the vehicle. When the user takes the apparatus away from the vehicle, the situation is reversed. In other words, the apparatus body will be at the wakeup mode when placed in the car.
While the invention has been described by way of example and in terms of a preferred embodiment, it is to be understood that the invention is not limited thereto. To the contrary, it is intended to cover various modifications and similar arrangements and procedures, and the scope of the appended claims therefore should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements and procedures.
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|U.S. Classification||340/572.1, 340/10.41|
|Jan 29, 2007||AS||Assignment|
Owner name: MITAC INTERNATIONAL CORP, TAIWAN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CHAN, YAO-CHEN;REEL/FRAME:018819/0059
Effective date: 20070124
|May 19, 2014||FPAY||Fee payment|
Year of fee payment: 4